Done 9:40-9:53am AST.
I performed several injections between 10:40-11:00am AST. Unfortunately, the status of the fast NOx lag time valve is not saved in the VI (Jacques saved the fast O3 lag time valve instead). He will update the VI and I’ll do more puff tests when it’s done.
The chromatograms look weird, at least very different from what we got last year.
Today’s chromatogram:
Last year:
I connected the NPL tank to STD3 inlet.
Inlet system sequence:
0) STD3 BVOC (2400 s)
1) Stop
This is chromatogram TL_20190521_12.
Based on the calibration performed on Sunday, we know that the fast O3 is biased low by ~28-30%. Conversion from counts to ppb has to be updated.
O3 span = 0.000445 becomes 0.000612
offset = 0.11 becomes -1.47
Changes made to VI at 6:46pm AST.
Data from the slow and fast O3 are now ~comparable (keeping in mind that slow O3 was 3% too low compared to calibrator).
Our sensor is off by ~80 degrees compared to data from the station (data available here.). I adjusted the position of the sensor accordingly at ~4pm local time.
Drierite changed on both fast NOx and O3 (at ~1:50-2pm local time). Put drierite in oven at 210°C for 1 hr (LAB 2).
The settings in the sequence of the inlet system were wrong; use settings from last summer (BVOC settings are different from OVOC settings):
* sample time = 2400
* sample flow = 1.25
* backflush time = 180
* desorb time = 300
* flash heat time = 2
* inject time = 30
* bakeout temp = 325 * bakeout time = 40
* carrier flow = 1.25
Started new sequence on GC/MS (and inlet system): GCMS_Toolik_20100521.sequence.xml
Note that the fast NOx data are now being saved in the fast O3 data files.
Columns headers:
* date fast O3 * time fast O3 (hhmm)
* time fast O3 (ss.s)
* counts
* O3 concentration (ppb)
* 0 fast O3 - NO valve status or lag time valve
* 1 fast O3 - NO valve status or lag time valve
* date fast NOx
* time fast NOx (hhmm)
* time fast NOx (ss.s)
* counts
* 0 or 1 (1 = auto mode)
* 0 or 1 (if NO or NOx)
* 0 or 1 (1 if calibration)
* 0 to 7: step in calibration
I performed a few tests with Jacques.
* O2 generator not stable. Changed the fittings at the outlet (see pic below), was damaged. O2 flow is now stable. Jacques still wonders whether the O2 might be contaminated (we see spikes from time to time) - Order ultra high purity O2.
I need to replace the Reed Switch.
1. Disconnect WS/WD rear of MET Controls box
2. Disconnect anemometer from tower
According to instructions:
3. Open the sensor housing
4. Disconnect the wires
TOP to BOTTOM: RED, BLACK, YELLOW, GREEN, WHITE.
5. Push switch cartridge out of its seat. Clean off any old sealant from the top plate assembly.
Done
The WS constantly increases. Something’s wrong. Jacques suggests that the sensor counts the # of rotations but doesn’t seem to convert to m/s. Something’s wrong in the VI. Problem fixed! Jacques made changes in the VI.
New VI: METTower_Toolik_190520.vi